Journal
SOIL SCIENCE AND PLANT NUTRITION
Volume 61, Issue 3, Pages 481-492Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00380768.2015.1005539
Keywords
map-based cloning; Oryza sativa; OsHKT2; 1; potassium; sodium
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Funding
- Ministry of Agriculture, Forestry, and Fisheries of Japan (Genetic-based technology for Agricultural Improvement) [LCT0004]
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Under potassium (K)-deficient conditions, rice (Oryza sativa L.) actively takes up and utilizes sodium (Na) as an alternative element to K. In this study, we cloned a gene responsible for cultivar differences in shoot Na accumulation using a map-based cloning method. The responsible gene OsHKT2;1 encodes an Na transporter associated with Na uptake in root tissues, and its expression level was positively correlated with Na uptake potential in 11 rice cultivars. We found that OsHKT2;1 overexpression promoted shoot Na accumulation under low K supply and proposed that OsHKT2;1 expression level is a key factor in the Na accumulation potential in rice cultivars. However, under sufficient K supply, OsHKT2;1-overexpressing rice plants accumulated Na in roots but not in shoots. This result suggests that Na transfer from root to shoot may be regulated by another Na transporter.
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